Electronically controlled squishable composite switch

Patent metadata

Field	Value
Publication number	US-9419147-B2
Application number	US-201514593066-A
Country	US
Kind code	B2
Filing date	Jan 9, 2015
Priority date	Nov 5, 2010
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A method and apparatus for making analog and digital electronics which includes a composite including a squishable material doped with conductive particles. A microelectromechanical systems (MEMS) device has a channel made from the composite, where the channel forms a primary conduction path for the device. Upon applied voltage, capacitive actuators squeeze the composite, causing it to become conductive. The squishable device includes a control electrode, and a composite electrically and mechanically connected to two terminal electrodes. By applying a voltage to the control electrode relative to a first terminal electrode, an electric field is developed between the control electrode and the first terminal electrode. This electric field results in an attractive force between the control electrode and the first terminal electrode, which compresses the composite and enables electric control of the electron conduction from the first terminal electrode through the channel to the second terminal electrode.

First claim

What is claimed is:

1. An electronic device, comprising:
a composite including a squishable material doped with a conductive particle throughout the squishable material;
a source configured to be coupled to the composite;
a drain configured to be coupled to the composite;
a gate electrically isolated from the source;
wherein application of a voltage above a predetermined threshold at the gate establishes an electric field between only the gate and source that compresses the composite and permits a predefined level of conductivity.

2. The electronic device of claim 1 , wherein the conductive particle is at least one selected from the group of nickel, gold, carbon nanotube fragments, graphene, graphite, metal particles, conductive metal oxide particles, and carbon black.

3. The electronic device of claim 1 , wherein the source has a stair case structure that supports proximity to the gate and minimizes a spring constant.

4. The electronic device of claim 1 , wherein the composite is uncompressed in an off state and compressed in an on state.

5. The electronic device of claim 1 , wherein the voltage is at least one of a positive or negative gate-to-source voltage that establishes an attractive force between the gate and the source.

6. The electronic device of claim 1 , further comprising:
the gate being tied to an input voltage;
the source being tied to ground; and
the drain being tied to a pull-up resistor,
wherein an output voltage across a drain-to-source varies in accordance with a power-supply voltage divider formed by the composite and the pull-up resistor on a condition that the input voltage is below a predetermined threshold voltage.

7. The electronic device of claim 1 , wherein the squishable material has a range of 2-10% curing agent by mass.

8. An electronic device, comprising:
a composite including a squishable material doped with a conductive particle throughout the squishable material;
a first terminal electrode configured to be coupled to the composite;
a second terminal electrode configured to be coupled to the composite; and
a control electrode electrically isolated from the first terminal,
wherein application of a voltage at the control electrode establishes an electric field between only the control electrode and a first terminal electrode that compresses the composite and permits a predefined level of conductivity from the first terminal electrode through the composite to the second terminal electrode.

9. The electronic device of claim 8 , further comprising:
a second control electrode, wherein compression of the composite is controlled by a voltage between the control electrode and the second control electrode and a conduction path is separate from the control electrode and the second control electrode.

10. The electronic device of claim 8 , further comprising:
a second composite;
a second first terminal electrode coupled to the second composite, wherein the first terminal electrode is tied to ground and the second first terminal electrode is tied to a supply voltage;
a second second terminal electrode coupled to the second composite, wherein the second terminal electrode and second second terminal electrode are tied to an output voltage; and
a second control electrode, wherein the control electrode and the second control electrode are tied to an input voltage,
wherein application of a voltage above a predetermined threshold at the control electrode and the second control electrode establishes an electric field between the control electrode and the first terminal electrode that compresses the composite and permits a predefined level of conductivity and application of a voltage below another predetermined threshold at the control electrode and the second control electrode establishes an electric field between the second control electrode and second first terminal electrode that compresses the second composite and permits a predefined level of conductivity.

11. The electronic device of claim 10 , wherein the first terminal electrode and the second first terminal electrode have stair case structures that support proximity to the control electrode and the second control electrode and minimize a spring constant.

12. The electronic device of claim 8 , wherein the conductive particle is at least one selected from the group of nickel, gold, carbon nanotube fragments, graphene, graphite, metal particles, conductive metal oxide particles, and carbon black.

13. The electronic device of claim 8 , wherein the composite is uncompressed in an off state and compressed in an on state.

14. The electronic device of claim 8 , wherein the squishable material has a range of 2-10% curing agent by mass.

Assignees

• Massachusetts Inst Technology

Inventors

• Bulovic Vladimir
• Lang Jeffrey H
• Paydavosi Sarah
• Wang Annie I-Jen
• Andrew Trisha L
• Murarka Apoorva
• Niroui Farnaz
• Yaul Frank
• Grossman Jeffrey C

Classifications

• Y10S977/742

  Carbon nanotubes, CNTs · CPC title

• H10D84/811

  Combinations of field-effect devices and one or more diodes, capacitors or resistors · CPC title

• H10D64/251

  Source or drain electrodes for field-effect devices · CPC title

• H10D48/50 Primary

  Devices controlled by mechanical forces, e.g. pressure · CPC title

• H01L29/84 Primary

  Electricity · mapped topic